Welding Drawings 2

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WELDING

DRAWINGS


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Definition

A welding drawing is a detailed multiview

drawing showing all the parts welded

together.


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The graphic representation of welded

parts is shown by welding symbols. The

weldment is not shown, but the joint linesare shown.

The welding symbols give all the

information necessary for the welder to

fasten the parts together using one thewelding techniques.


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Welded joints


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Weld Symbols

Each type of weld is characterized by a

basic symbol derived from its section

shape. Supplementary symbols are usually

used to specify the contour of the weld,

whether the welding is performed in the

field or in the shop, or if it is applied allaround the welded part.


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The weld symbol consists of

eight parts which are as follow:1. Reference line

2. Leader line

3. Basic weld symbol (location/depth of weld)4. Finish symbol

5. Weld symbol (type of weld)

6. Dimensions

7. Supplementary symbols8. Tail and specification


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Supplementary weld symbols:


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The weld symbol is attached to the horizontal portion of the

leader line, called the reference line, see figure below.

The text height is 3 mm.

The arrow points to the area to be welded.

The tail is used when a specification is made to the weld symbol.


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Supplementary weld

symbols:A. A weld symbol is centered and placed below the reference

line if the weld is on the same side as the arrow.

B. A weld symbol is centered and placed above the referenceline if the weld is on the opposite side as the arrow.

C.A weld symbol is centered and placed above and below thereference line if the weld is to be on both sides of the joint.

D. A weld symbol is placed at the intersection of the leader andthe reference lines if the weld is to be all-around the joint.

E. When the welding process is to take place in the field or onthe site of assembly, a special symbol in the form of a flag isused.

F. The melt-through symbol is used when there is to be 100%penetration of the weld from one side all the way through thejoint.


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G. The backer or spacer material symbol is used whensmall extra piece is to be added between the parts tobe welded.

H. Contours symbols are used to represent welds that aremachined. Horizontal lines for flush contours, arcs forconvex or concave contours. Methods of finishing arerepresented by the following letter designations, placedabove or below the contour symbol: G- grinding, C-chipping, M-machining, R-rolling, and H-hammering.

I. If a joint is to be prepared prior to welding, such asmachined, then the leader line is bent.

Welding Drawings 2

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Transcript of Welding Drawings 2